Bobcat S185 Display Won’t Power Off: Troubleshooting and Solutions

[MikePhua]

The Bobcat S185 is a popular skid steer loader known for its versatility and robustness, frequently used in construction, landscaping, and other heavy-duty tasks. However, like any complex piece of machinery, it can experience electrical issues from time to time. One common problem that some S185 owners face is a display that won’t power off, causing the machine to drain its battery or, worse, create malfunctioning electrical systems. This article provides an in-depth look at why this issue occurs, how to troubleshoot it, and the best ways to resolve it.
Understanding the Bobcat S185 Display System
The Bobcat S185, equipped with a digital display, provides essential information to the operator, including machine diagnostics, fuel levels, engine temperature, and more. This display system is part of the electronic control module (ECM), which plays a critical role in managing various electrical systems on the skid steer. The S185 is powered by a robust 60-horsepower engine and is renowned for its reliability, but its electrical system can sometimes encounter glitches.
When the display remains on, it may indicate an issue within the machine’s electrical or wiring systems, such as a malfunctioning relay or a failed component in the control module. Understanding how these systems interact is key to diagnosing and fixing the problem.
Potential Causes of the Display Not Turning Off
Several potential factors could cause the display to remain powered on even after the machine is turned off. Some of the most common causes include:

1. Faulty Ignition Switch: The ignition switch on the S185 is responsible for sending power to the ECM and display system. If the switch fails or gets stuck in the "on" position, the display will remain powered.
   
2. Defective Relay or Fuse: The Bobcat S185 has various relays that control the power to different components, including the display. If one of these relays malfunctions, it could cause the display to stay on. Similarly, a blown fuse or a fuse that is not seated properly can cause an electrical fault that keeps the display activated.
   
3. Wiring Issues: Over time, the wires connecting the ignition switch, ECM, and display system can become frayed, loose, or corroded. A short circuit or loose connection may prevent the display from turning off.
   
4. Faulty Electronic Control Module (ECM): The ECM is the heart of the machine's electrical system, managing communication between the various sensors and the display. A failure in the ECM can sometimes result in continuous power to the display, even after the machine has been powered down.
   
5. Corrosion or Dirt Build-Up: In environments where the Bobcat S185 is used outdoors, dirt, moisture, and corrosion can accumulate in the electrical connectors. This can cause malfunctioning of the control systems, leading to the display staying on.
   

Step-by-Step Troubleshooting Process
If you’re experiencing issues with the display not powering off, here’s a step-by-step guide to help you troubleshoot the problem.

1. Inspect the Ignition Switch: Start by checking the ignition switch for any signs of wear or damage. If the switch feels sticky or doesn’t return to the “off” position properly, it could be stuck in the “on” position, sending power to the display. Replacing a faulty ignition switch is a relatively simple task that can resolve the issue.
   
2. Examine Relays and Fuses: Check the fuses and relays connected to the display and ECM. Look for any blown fuses or relays that are not functioning correctly. The Bobcat S185 has a dedicated fuse box, which should be clearly labeled for easy identification. If you find any damaged components, replace them with the correct parts.
   
3. Inspect the Wiring: Carefully examine the wiring connections between the ignition switch, ECM, and display. Look for signs of wear, corrosion, or loose connections. Cleaning the connectors and securing any loose wires can often fix the issue.
   
4. Test the ECM: If the ignition switch, relays, fuses, and wiring all seem to be in good condition, the issue may lie with the ECM. Diagnosing an ECM problem often requires specialized diagnostic tools that can communicate with the machine’s computer. If you suspect the ECM is malfunctioning, it’s best to consult a professional technician for further analysis.
   
5. Look for Moisture or Corrosion: In wet or muddy conditions, moisture can seep into electrical components, causing corrosion. Check for any signs of corrosion around the connectors, particularly in areas exposed to the elements. Cleaning the connectors and applying dielectric grease can help prevent further corrosion and ensure proper electrical function.
   

Preventive Measures
While troubleshooting and repairs can resolve the display issue, taking steps to prevent it from happening again is equally important. Here are some preventive measures to help you keep your Bobcat S185 in good working order:

1. Regular Maintenance: Regularly inspect the electrical system of your Bobcat S185, checking for signs of wear and tear on wires and connectors. Routine maintenance can prevent small issues from escalating into bigger problems.
   
2. Cleanliness: Keep the machine's electrical components clean and free of dirt and moisture. Use compressed air to blow out any debris, and apply a protective coating to prevent corrosion.
   
3. Proper Storage: When the machine is not in use, store it in a dry, sheltered area to reduce exposure to the elements. This can help prevent moisture from getting into the electrical system and causing issues with the display.
   
4. Use Quality Parts: Always replace faulty components with OEM (original equipment manufacturer) parts. Using high-quality parts ensures the longevity and reliability of your equipment.
   

Conclusion
A Bobcat S185 display that won’t power off is a frustrating problem, but it is typically caused by one of several electrical issues, such as a faulty ignition switch, relay, or wiring problem. By following a systematic troubleshooting process, you can identify the root cause and take appropriate corrective actions. Regular maintenance and cleanliness will also help ensure that this issue doesn’t occur again in the future.
The Bobcat S185 has earned a reputation for reliability in the field, and by taking care of its electrical system, you can extend the lifespan of the machine and continue to get the most out of its powerful performance.